한국수산과학회

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  • pISSN : 2234-8395
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  • eISSN : 2234-1757

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kfas, vol. 51, no. 5, pp.549-555, October, 2018
DOI. https://doi.org/10.5657/KFAS.2018.0549

Enriched Rotifer Feeding Efficiency in the Walleye Pollock
Theragra chalcogramma Depends on Larval Fatty Acid Composition
명태(Theragra chalcogramma) 자어의 지방산 조성에 따른 영양강화
로티퍼의 먹이효율

박진철·홍우석1·서주영1·남원식·권오남*
어업회사법인 가비㈜, 1강원도 한해성수산자원센터

The objectives of this study were to confirm the nutritional requirements and improve the survival of the walleye
pollock Theragra chalcogramma, a cold seawater fish, by enrichment. We analyzed the fatty acids and amino acids
of fertilized pollock eggs before hatching, just-hatched larvae, larvae that had absorbed only the yolk sac, and larvae
starved for 2 days after yolk absorption. For the survival improvement experiment, we administered docosahexaenoic
acid (DHA), eicosapentaenoic acid (EPA), and DHA-EPA enrichment. Fatty acid decreased DHA and EPA content.
On the 30th day, body growth was significantly greater in pollock given the EPA and DHA-EPA treatments (P<0.05).
Larval survival at 20 and 30 days after hatching (DAH) was greatest under the DHA-EPA treatment (P<0.05). Survival
was significantly lower under the EPA treatment at 10 DAH, but then increased to approach that seen under
the EPA-DHA treatment (P<0.05). Therefore, we determined that reduced survival in hatchlings of high-mortality
pollack could be improved by controlling EPA and DHA content during enrichment. We conclude that cold seawater
fish must be given feed that meets their nutritional needs, which can be accomplished using newly manufactured
enrichment products for the larvae of cold seawater fish, such as pollock.

Keyword : Key words: Walleye Pollock, Theragra chalcogramma, Nutritional Requirement, Early larvae, EPA

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